Gukesh decides to prevent b2-b4. A logical decision, but this creates some weaknesses on the queenside.
9. b1c3  9... e8g8  10. f1e1 A good development move before playing d3-d4, which can lead to simplifications. 10... h7h6 A new move and a difficult choice. Gukesh plays a useful move. Now after Be6 there's no Ng5. 11. a2a3 White plays a useful move.